New GTA: The Trilogy screenshot leaked with amazing details of a forest

Players have found a new Grand Theft Auto: The Trilogy — The Definitive Edition screenshot on Grove Street Games' site. This is the studio behind the remastered versions.
The new image shows the amazing details in a very green forest. We can see the big amount of grass, leaves and rocks. It seems this is a screenshot made on Unreal Engine. The locations is similar to foot of Mount Chiliad of the original Grand Theft Auto: San Andreas.
If it's really the same region, the differences are astounding. The environment was changed drastically, the low poly ground is gone and there are a ton of new assets.
But we can't confirm that's was taken from GTA: The Trilogy. Grove Street Games mentioned that it's a photorealistic landscape, and didn't connect to the remaster.
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